Very hard to say. Depends a bit on the market for singlespeeds or track in your area. Here in Seattle where road singlespeeding is popular and there is a velodrome, that bike, which looks to be in very good condition might get $400 or more. That is a pretty wild guess though.
Take a look at recent ebay sales of similar to get an idea.
There is a Velodrome close to where I live, and I do know alot of people who go there. I put $200 worth of work into it at the bike shop to get it in good shape so I hope I can get atleast that.